Thirty years ago, the first bulletin board for gay and lesbian students was put up at the University of Chicago Law School.“They put it behind Plexiglas so that it would not be defaced,” said U.S. Magistrate Judge Mary M. Rowland, who was attending the school then.But it’s a different world now.Law students applying for clerkships and lawyers seeking jobs feel free to place information — for example, membership in certain organizations — that indicate they are gay.And Rowland’s sexual …